Hollow fiber semipermeable membrane element and a method of producing the same

Abstract

There is disclosed a hollow fiber semipermeable membrane element comprising hollow fiber semipermeable membranes having their respective one end portions or both end portions bonded together by means of a vulcanized rubber, so that the semipermeable membrane element has a high resistance to chemicals. The incorporation of a graphite fluoride in the rubber serves to further increase not only the hardness of the bonding rubber portions but also the resistance of the bonding rubber portions to chemicals. Such a semipermeable element can be easily, efficiently produced on a commercial scale.

What is claimed is: 
     
       1. A hollow fiber semipermeable membrane element comprising a plurality of hollow fiber semipermeable membranes substantially equal in length, arranged in a lengthwise direction and bonded together by means of vulcanizing an unvulcanized rubber coated on individual hollow fiber semipermeable membranes at their end portions. 
     
     
       2. A hollow fiber semipermeable membrane element according to claim 1, wherein said vulcanized rubber contains a graphite fluoride in an amount of 1 to 100% by weight based on the weight of the rubber value of said vulcanized rubber.